And yet it opened in the blackest disappointment. With high hopes we struck across the peaty, russet moor, intersected with a thousand sheep paths, until we came to the broad, light-green belt which marked the morass between us and Holdernesse. Certainly, if the lad had gone homeward, he must have passed this, and he could not pass it without leaving his traces. But no sign of him or the German could be seen. With a darkening face my friend strode along the margin, eagerly observant of every muddy stain upon the mossy surface. Sheep-marks there were in profusion, and at one place, some miles down, cows had left their tracks. Nothing more.

“Check number one,” said Holmes, looking gloomily over the rolling expanse of the moor. “There is another morass down yonder, and a narrow neck between. Halloa! halloa! halloa! what have we here?”

We had come on a small black ribbon of pathway. In the middle of it, clearly marked on the sodden soil, was the track of a bicycle.

“Hurrah!” I cried. “We have it.”